linux-kernel - [PATCH] [media] au0828: fix double free in au0828_usb

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Message-Id: <1461362707-6883-1-git-send-email-khoroshilov@ispras.ru>
Date:	Sat, 23 Apr 2016 01:05:07 +0300
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Shuah Khan <shuahkh@....samsung.com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: [PATCH] [media] au0828: fix double free in au0828_usb_probe()

In case of failure au0828_v4l2_device_register() deallocates dev
and returns error code to au0828_usb_probe(), which also
calls kfree(dev) on a failure path.

The patch removes duplicated code from au0828_v4l2_device_register().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/media/usb/au0828/au0828-video.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/media/usb/au0828/au0828-video.c b/drivers/media/usb/au0828/au0828-video.c
index 32d7db96479c..7d0ec4cb248c 100644
--- a/drivers/media/usb/au0828/au0828-video.c
+++ b/drivers/media/usb/au0828/au0828-video.c
@@ -679,8 +679,6 @@ int au0828_v4l2_device_register(struct usb_interface *interface,
 	if (retval) {
 		pr_err("%s() v4l2_device_register failed\n",
 		       __func__);
-		mutex_unlock(&dev->lock);
-		kfree(dev);
 		return retval;
 	}
 
@@ -691,8 +689,6 @@ int au0828_v4l2_device_register(struct usb_interface *interface,
 	if (retval) {
 		pr_err("%s() v4l2_ctrl_handler_init failed\n",
 		       __func__);
-		mutex_unlock(&dev->lock);
-		kfree(dev);
 		return retval;
 	}
 	dev->v4l2_dev.ctrl_handler = &dev->v4l2_ctrl_hdl;
-- 
1.9.1